I actually used that same carpet tack idea to do the same on my 72 SS Chevelle back in high school.The carpet was pillowing badly after my cousin used it & left all my windows open overnight during a heavy rain storm.We tried hair dryers etc,but nothing worked.
Drilled holes through the carpet into the floor,and Voila!,it worked.

I have a 69 300 deluxe hard top that had a few of those nails in the floor. I'm pretty sure it was to hold down the rubber mat or carpet in your case. Yours is on only the second time I've seen this.

Is your car a Baltimore built car?

Not sure if you have these photos but i just came across them in my stash. This is when i believe it was on ebay in Nevada for sale if i remember correctly. I do have 4 or 5 pictures

Appreciate it, but this thread was started back a few years ago.

https://www.yenko.net/forum/showthre...range+chevelle

Your link got me to go back to the beginning, again and THIS pic grabbed my attention this time. I wondered why the column had been changed to a 3 on the tree ?? Looking at it further, it looks original to the car. Since '69 was the first year of the ignition/trans interlock mandate did GM just use this column for the 1st/reverse lever for the lock rod to activate ??? When you removed it, did you see any indication it wasn't from the factory ?

https://www.yenko.net/forum/attachme...1&d=1691723351

The column was clearly removed and the auto unit was dumped back in. Like i mentioned earlier this car was parked on an indian reservation. Probably not much value to that owner at the time.

Color Spray Out and bunch of misc items
 

Weekend of running. zinc and yellow zinc plating done. Radiator being recored. Picked up some sample 72 paint for a color spray out test. Looks very close,

How do you know what nut, bolt, and washer goes where?
Experience at doing these restorations so many times?

When i first started redoing cars I would take pictures of bolt head markings. To be honest when your putting the car back together its process of elimination. The only place that can get confusing is on the interior finish screws but I mostly buy all reproduction of that stuff and everything mostly reproduced is spot on. Ive also kept a bit of a picture catalogue of different gm bolts/fastners with part numbers. This can also get confusing as i find different plants, different years, and even different times of the year bolt head markings changed, or even were mixed as cars were assembled.

Dad and I actually make a game out the pile. I can probably half the time get the location right just by looking at it, Dad is more like 90%.

My best advice is take pictures of the bolts for various assemblies together. If need be put a measuring stick in the picture so you have a size reference. If you dont know about AMK fastners, look them up and utilize there catalogues and other ref material to learn about what bolt was what gm number. Some of there stuff is spot on and some isnt. It also gets a little more dicey as some plants didnt follow the assembly manual and decided on there own fastner with different head, length, etc.